Apparatus for heating air to be supplied to furnaces.



No. 659.56l. Patented Oct. 9, I900. W. C. WALLACE.

APPARATUS FOR HEATING AIR TO BE SUPPLIED TU FURNACES.

(Applicatioiz filed June 26. 1900.\ (llq lloglel.) 3 Sheets-Shoat l.

ATTORNEYS m: norms PEYERS coy, movouma. wAsmNuYoN, o c.

No. 659.56I. Patented 0st. 9, I900.

w. c. WALLACE. APPARATUS FOR HEATING AIR TO BE SUPPLIED T0 FURNACES.

(Applies-tick filed June 28, 1900.) {N0 Model.) 3 Shams-Sheet 2.

WITNESSES .INVENTOR M William fla law ATTORNEYS THE mums PETERS co..morouwa. vmumsfou. q c

No. 659,561. Patented Oct. 9, 1900 w. c. WALLACE. APPARATUS FOR HEATINGAIR TO BE SUPPLIED T0 FURNACES.

(Application filed June 28, 1900.) (No Model.) 3 Sheets-Sheet 3.

M WITNESSES )7 I mvEr uTosy Mam m sv' fi vflanj ATTOR NE Y8 UNrrnnSTATES PATENT OFFICE. V I

YVILLIAM OARLILE WALLACE, OF SHEFFIELD, ENGLAND, ASSIGNOR OF ONE- HALFTO THE JOHN BROWN & COMPANY, LIMITED, OF SAME PLACE.

APPARATUS FOR HEATING AIR TO BE SUPPLIED TO FURNACES.

SPECIFICATION formingpart of Letters Patent No. 659,561, dated October9, 1900.

Application filed June 28, 1900. Serial No. 21,980- (lIo model.)

To all whom it may concern.-

Be it known that I, WILLIAM CARLILE WAL LACE, a subject of the Queen ofGreat Britain and Ireland, and a resident of Atlas Works, Sheffield,inthe county of York,England, have invented certain new and usefulImprovements in Apparatus forHeat-ing Air to be Supplied to Furnaces,(for which application has been made for a patent in Great Britain, No.8,723, dated May 11, 1900,) which invention is fully set forth in thefollowing specification.

This invention has for its object to provide apparatus in connectionwith furnaces whereby air is heated for supply to the furnaces in a moreefficient manner than hitherto.

In the accompanying drawings a portion of a boiler and furnace is shownsufficient to illustrate the application of this invention thereto.

Figure 1 is a half-front elevation and halftransverse section. Fig. 2 isa longitudinal section, and Fig. 3 is a horizontal section.

The heating of the air is effected by causing it on its way to thefurnace to come into contact with tubes at, through which pass theheated products from the furnace, the said products entering the tubesfrom the space Z) below. The said tubes copass through perforations c ina plate d, which perforations are of such a size as to leave a small andpreferablyannular space around each of the tubes. The said plateconstitutes adivision between an upper airspaoe 6, into which the air tobe heated enters by openings at f, and a lower air-chamber g, into whichthe air passes from the upper air-space through the perforations c inthe said plate 61 and in close contact with the said tubes at, the saidair thence passing by the outlet it into the passage t', leading intothe furnace.

In order to cause the air to come into efficient contact with the tubesa in the lower air-chamber g and prevent the said air passing directlyacross the tubes to the outlet h and air-passage 4;, leading to thefurnace, depending plates are, according to this invention, used,extending down from the perforated plate d, the said depending plates Itbeing preferably longerthat is, they extend nearer to the bottom of thesaid space-as they approach the center. The said depending plates 70conduct the air downward and cause the said air to come into efficientcontact with the said tubes a. The said tubes at are preferably arrangedso that the spaces between the several transverse rows thereof are wideralternately at opposite sides, as shown in the plan at Z, so as to allowthe air entering sidewise to find ready access to between the tubes atin the upper air-space.

The arrangement illustrated is provided with a double arrangement ofairspaces for supplying heated air to three furnaces, the division-platem dividing the air-spaces; but it will be understood that a singlearrangement or more than two arrangements, as described,incombination,can be used,if desired.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim is- 1. In apparatus for heating air to be supplied tofurnaces the combination with tubes through which the heated productsfrom the furnace pass of an air-chamber the upper plate of which isprovided with perforations through which the tubes pass the saidperforations being of such a size as to leave spaces between the tubesand perforations for the inlet of air to the said air-chamber, an outletfrom the said air-chamber to a passage leading to the furnace anddepending plates extending down from the perforated plate between thetubes so arranged as to conduct the air downward and cause it to comeinto efficient contact with the tubes substantially as hereinbeforedescribed.

2. 1n apparatus for heating air to be supplied to furnaces thecombination with tubes through which the heated products from thefurnace pass of an air-chamber the upper plate of which is provided withperforations through which the tubes pass the said perforations being ofsuch a size as to leave spaces for the inlet of air to the saidair-chamber and the tu bes and perforations being arranged so that thespaces between the several transverse rows thereof are wider alternatelyat opposite sides, an outlet from the said airchamber to a passageleading to the furnace and depending plates extendingdownfremspecificationjnzthe preseneev ofitiwosu bscri b the perforated"plate: between the. tubes so aning witlnesses.

ranged as to conduct the air downward and 1 cause it to come intoefficient contact with the WILLIAM CARLILE WALLACE 5 tubes allsubstantially as hereinbefore de- Witnesses:

scribed. FRANK 'E. BECHTOLD In testimony whereof I have signed this JOB.KLEIN;

